scholarly journals Decarboxylation of p-Coumaric Acid during Pyrolysis on the Nanoceria Surface

2021 ◽  
Vol 5 (4) ◽  
pp. 48
Author(s):  
Nataliia Nastasiienko ◽  
Tetiana Kulik ◽  
Borys Palianytsia ◽  
Mats Larsson ◽  
Tetiana Cherniavska ◽  
...  
Keyword(s):  
Decomposition Product ◽  
Raw Materials ◽  
Temperature Programmed Desorption ◽  
Bridge Structure ◽  
Coumaric Acid ◽  
Thermal Transformations ◽  
Main Decomposition ◽  
Ft Ir ◽  
Temperature Programmed ◽  
Ft Ir Spectroscopy

Temperature-programmed desorption mass spectrometry (TPD MS) was used to study the pyrolysis of p-coumaric acid (pCmA) on the nanoceria surface. The interaction of pCmA with the CeO2 surface was investigated by FT-IR spectroscopy. The obtained data indicated the formation on the nanoceria surface of bidentate carboxylate complexes with chelate (Δν = 62 cm−1) and bridge structure (Δν = 146 cm−1). The thermal decomposition of pCmA over nanoceria occurred in several stages, mainly by decarboxylation. The main decomposition product is 4-vinylphenol (m/z 120). The obtained data can be useful for studying the mechanisms of catalytic thermal transformations of lignin-containing raw materials using catalysts containing cerium oxide and the development of effective technologies for the isolation of pCmA from lignin.

scholarly journals Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy

2019 ◽  
Vol 3 (1) ◽  
pp. 34 ◽  
Author(s):  
Nataliia Nastasiienko ◽  
Borys Palianytsia ◽  
Mykola Kartel ◽  
Mats Larsson ◽  
Tetiana Kulik
Keyword(s):  
Mass Spectrometry ◽  
Thermogravimetric Analysis ◽  
Cerium Dioxide ◽  
Temperature Programmed Desorption ◽  
Hydroxyl Groups ◽  
Surface Complexes ◽  
Desorption Mass Spectrometry ◽  
Ft Ir ◽  
Temperature Programmed ◽  
Ft Ir Spectroscopy

The studies of pyrolysis of caffeic acid (CA) and its surface complexes is important for the development of technologies of heterogeneous catalytic pyrolysis of plant- and wood- based renewable biomass components. In this work, the structure and thermal transformations of the surface complexes of CA on the surface of nanoceria were investigated using Fourier transform–infrared (FT–IR) spectroscopy, thermogravimetric analysis (TGA) and temperature-programmed desorption mass spectrometry (TPD MS). It was found that CA on the surface of cerium dioxide forms several types of complexes: bidentate carboxylates, monodentate carboxylates and complexes formed as a result of interaction with phenolic hydroxyl groups. This is due to the ability of nanosized cerium dioxide to generate basic hydroxyl groups that can deprotonate phenolic groups to form phenolates on the surface. The main pyrolysis products were identified. The possible ways of forming 3,4-dihydroxyphenylethylene, acetylene carboxylic acid, pyrocatechol and phenol from surface complexes of CA were suggested. It was established that on the nanoceria surface effectively occur the decarboxylation, decarbonylation, and dehydration reactions of the CA, which are the desirable processes in biomass conversion technologies.

scholarly journals Catalytic pyrolysis of lignin-cellulose biomass and its model phenolic components on the nanosized oxides surface

2021 ◽  
pp. 241-254
Author(s):  
Tetiana V. Kulik ◽  
◽  
Nataliia S. Nastasiienko ◽  
Borys B. Palianytsia ◽  
Kostiantyn S. Kylik ◽  
...  
Keyword(s):  
Catalytic Pyrolysis ◽  
Raw Materials ◽  
Rapeseed Meal ◽  
Spectroscopic Studies ◽  
Raw Material ◽  
Thermal Transformations ◽  
Renewable Biomass ◽  
Fundamental Research ◽  
Nanosized Oxides ◽  
Temperature Programmed

Lignocellulose is currently considered as a potential renewable source of a wide range of valuable chemicals, including aromatics. Catalytic pyrolysis is the promising method for the conversion of biomass raw materials. The development of renewable biomass pyrolysis technologies requires fundamental research on catalytic thermal transformations of lignocellulosic raw materials. Therefore, in this work, the methods of IR spectroscopy, temperature programmed desorption mass spectrometry (TPD MS) and thermogravimetric analysis were used to investigate the catalytic thermal transformations of rapeseed meal (RM) and ferulic acid (FA) as a model phenol-containing component of such raw material on the surface of nanosized oxides CeO2, SiO2 TiO2/SiO2, Al2O3/SiO2 and CeO2/SiO2. The most effective catalyst in the conversion of biomass to ketones was a nanocomposite CeO2/SiO2 with the highest content of nanoparticles of CeO2 (24%). According to the data of FTIR spectroscopic studies, the interaction of FA with the CeO2 surface occurs with the participation of phenol and carboxyl groups. The main products of thermal decomposition of FA on the surface of CeO2 are 3-methoxy-4-vinylphenol, guaiacol, coumaric acid and hydroxybenzene. Condensed aromatics (naphthalene, alkylnaphthalenes) were registered in small quantities.

Study on the Characteristic Spectral Properties for Species Identification of Animal-Derived Feedstuff Using Fourier Transform Infrared Spectroscopy

2017 ◽  
Vol 71 (11) ◽  
pp. 2446-2456 ◽  
Author(s):  
Fei Gao ◽  
Simiao Zhou ◽  
Zengling Yang ◽  
Lujia Han ◽  
Xian Liu
Keyword(s):  
Fourier Transform ◽  
Animal Species ◽  
Raw Materials ◽  
Fourier Transform Infrared ◽  
Species Discrimination ◽  
Spectral Bands ◽  
Terrestrial Animal ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The objective of the present study was to explore the effective spectral bands related to lipid characteristics in spectra of raw animal-derived feedstuff and figure out which marked spectral regions (single or combined) contributed more to species discrimination. A total of 82 meat and bone meals, including porcine, poultry, bovine, ovine, and fish, were studied. Raw materials, extracted lipid, and defatted samples were simultaneously analyzed and calculated using Fourier transform infrared (FT-IR) spectroscopy in combination with chemometric methods. Taking the spectra of lipid as references, five marked spectral regions considered the main lipid characteristic regions were found in the raw animal-derived feedstuff spectra. In the study, single and combined marked spectral bands were investigated and proved to have better performance than the whole spectra of raw terrestrial animal-derived feedstuff and fishmeal. For the discrimination of five animal species, the regions of 1800–1650 cm–1, 1500–1330 cm–1, 1260–1060 cm–1, and 790–640 cm–1 presented better results; for the classification of three categories, the regions of 3100–2800 cm–1, 1800–1650 cm–1, and 1500–1330 cm–1 showed the best results.

Micro-Raman and FT-IR spectroscopy study of the thermal transformations of St. Claire dickite

2001 ◽  
Vol 16 (1-2) ◽  
pp. 319-327 ◽  
Author(s):  
S. Shoval ◽  
M. Boudeulle ◽  
S. Yariv ◽  
I. Lapides ◽  
G. Panczer
Keyword(s):  
Ir Spectroscopy ◽  
Spectroscopy Study ◽  
Thermal Transformations ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

scholarly journals Enhancing properties of PC/PA blends via compatibilization of olefin-maleic-anhydride copolymer based additives in masterbatch form

2021 ◽  
Vol 28 (8) ◽  
Author(s):  
T. Kovács ◽  
L. Simon-Stőger ◽  
B. Heller ◽  
Cs. Varga
Keyword(s):  
Mechanical Properties ◽  
Maleic Anhydride ◽  
Water Resistance ◽  
Raw Materials ◽  
Polymeric Materials ◽  
High Moisture ◽  
Polymer Blending ◽  
Ft Ir ◽  
Maleic Anhydride Copolymer ◽  
Ft Ir Spectroscopy

AbstractPolymer blending has been a simple and efficient way for designing and controlling the performance of polymeric materials using easily available types. Both polycarbonate and polyamide have excellent mechanical properties and thermal stability but their disadvantages such as limited chemical or water resistance can be eliminate by tailoring them. Main difficulties in processing of PC/PA blends are the poor compatibility and high moisture adsorption capacity of the two raw materials complicating processing and also deteriorating mechanical properties of the products. Compatibilizing additives such as olefin-maleic-anhydride copolymer based compounds used in the experimental work can help to overcome the abovementioned difficulties. To determine the processing conditions of the raw materials several drying temperatures have been tested and thermal degradation has been examined by FT-IR spectroscopy. Experimental compatibilizing additives based on an olefin-maleic-anhydride copolymer have been investigated to enhance mechanical properties of the blends prepared by extrusion moulding. Mechanical, rheological, SEM and FT-IR measurements have been performed and at least one additive has been found to be efficient in improving selected properties.

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